CN110815965B - Fiber reinforced metal composite material and application thereof - Google Patents

Fiber reinforced metal composite material and application thereof Download PDF

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Publication number
CN110815965B
CN110815965B CN201810892107.XA CN201810892107A CN110815965B CN 110815965 B CN110815965 B CN 110815965B CN 201810892107 A CN201810892107 A CN 201810892107A CN 110815965 B CN110815965 B CN 110815965B
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China
Prior art keywords
magnesium alloy
layer
fiber
composite material
curing
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CN201810892107.XA
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Chinese (zh)
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CN110815965A (en
Inventor
金秋
王松
黄维中
宋卓能
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Ka Shui Manufactory Co ltd
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Ka Shui Manufactory Co ltd
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Priority to CN201810892107.XA priority Critical patent/CN110815965B/en
Priority to US16/116,918 priority patent/US11312108B2/en
Publication of CN110815965A publication Critical patent/CN110815965A/en
Priority to US17/095,810 priority patent/US11618246B2/en
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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)

Abstract

In one aspect, the invention provides a fiber reinforced metal composite material, which comprises a metal layer and a fiber layer which are stacked, wherein adjacent layers are fixed by bonding; the composite material is of a two-layer or three-layer structure, layers are closely attached, the thickness is 0.6-0.9 mm, the structural characteristics of the existing fiber metal composite material, which are generally more than three layers, are changed, the thickness of the composite material is greatly reduced, and meanwhile, good mechanical properties are maintained. On the other hand, the invention discloses application of a fiber reinforced metal composite material in the field of case and bag manufacturing, and provides two preparation methods of a fiber reinforced metal case shell, which are simple and easy to operate.

Description

Fiber reinforced metal composite material and application thereof
Technical Field
The invention belongs to the technical field of materials, and particularly relates to a fiber reinforced metal composite material and application thereof in the field of bag manufacturing.
Background
At present, the hard luggage in the market generally adopts plastics or metal as raw materials, and compared with the luggage made of plastics, the luggage made of metal has the advantages of high strength, long service life and high quality. Because aluminum alloy has higher strength and the surface treatment technology of aluminum alloy is developed more mature, the metal luggage in the market is usually made of aluminum alloy materials. The aluminum alloy luggage case has the following defects: (1) The weight is heavy, and the weight of the aluminum alloy is about 2.5 to 3 times of the weight of the plastic product under the condition of the same thickness; (2) The aluminum alloy shell is easy to scratch, so that the attractive appearance effect is affected; (3) Poor impact resistance and is easy to damage in the transportation process.
In recent years, magnesium alloys have been used as the case material, and the density of magnesium alloys is smaller than that of aluminum alloys, so that the weight of the case can be reduced by about 1/3; the magnesium alloy also has the characteristics of strong external impact resistance and excellent damping resistance, so that the luggage case made of the magnesium alloy has the advantages of light weight and good damping effect. However, when a magnesium alloy sheet with a small thickness is used alone to manufacture a suitcase, there is still a problem that the suitcase is deformed by external force; in addition, magnesium alloy is easy to oxidize and corrode, and especially in high-temperature and humid environments, the appearance effect of the product is affected.
Therefore, there is an urgent need to develop a novel composite material which is light in weight, thin in thickness, and excellent in mechanical properties and corrosion resistance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the fiber reinforced metal composite material which has the excellent characteristics of fiber materials and metal materials, is light in weight and excellent in fatigue resistance, and has good comprehensive mechanical properties and easy processing characteristics. On the other hand, the invention discloses the application of the fiber reinforced metal composite material in the field of bags, namely: the fiber reinforced metal composite of the present invention is used to make a bag and a corresponding method of manufacture is provided.
The fiber reinforced metal composite material comprises a metal layer and a fiber layer which are arranged in a laminated manner, wherein the adjacent layers are fixed through bonding; the composite material is of a two-layer or three-layer structure, and the layers are closely attached. Because the thermal expansion coefficients of the fiber layer and the metal layer are more different, the traditional fiber-metal composite material is generally of a structure with more than three layers and has a thickness of several millimeters or even a centimeter level, the internal stress generated when the material is cooled after solidification is balanced by adopting a symmetrical structure, and the fiber-reinforced metal structure composite material is of a two-layer or three-layer structure, so that the structure composition is simplified, and the thickness of the composite material is effectively reduced.
Further, the two-layer structure comprises an outer metal layer and an inner fiber layer, wherein the outer metal layer and the inner fiber layer are bonded through a room temperature curing adhesive, and the room temperature curing adhesive is used for assisting materials to complete curing at the temperature of 20-30 ℃. The bonding sites between the fiber layer and the metal layer are generated at room temperature (20-30 ℃) by adopting an adhesive solidified at room temperature, so that deformation caused by different material shrinkage rates in the cooling stage of a heat curing system is avoided.
Further, the three-layer structure comprises a first metal layer, a middle fiber layer and a second metal layer which are sequentially laminated, wherein adjacent layers are bonded through a room temperature curing adhesive or a heat curing adhesive, and the heat curing adhesive is used for assisting materials to complete curing at the temperature of 40-180 ℃.
Further, the thickness of the composite material is 0.6 mm-0.9 mm.
Further, the metal layer is a magnesium alloy layer; the fiber layer is fiber prepreg cloth or fiber cloth without resin, and the fiber material is one or a mixed fabric of more of carbon fiber, kevlar fiber, polypropylene fiber and glass fiber.
The case shell of the case is manufactured by adopting the fiber reinforced metal composite material, wherein the metal layer of the composite material is magnesium alloy, the fiber layer is fiber prepreg cloth or fiber cloth without resin, and the fiber material is mixed fabric of one or more of carbon fiber, kevlar fiber, polypropylene fiber and glass fiber. The invention also discloses a preparation method of the case shell of the fiber reinforced magnesium alloy case, which is applicable to composite materials with two-layer structures and three-layer structures, and specifically comprises the following steps:
s1, preparing a magnesium alloy fiber composite material with a two-layer or three-layer structure, so that the magnesium alloy fiber composite material is partially solidified;
s2, processing the partially solidified magnesium alloy fiber composite material in the step S1 into a box shell shape in a hot press molding or bending molding mode;
s3, completely curing the box shell composite material.
In the above steps, step S2 is implemented by a hot press or a bending machine. When a hot press forming mode is adopted, the hot press temperature is between 20 ℃ and 140 ℃, the pressing time is 3-15 min, and the pressure is 0.2-1 MPa; in particular, for hot pressing at a temperature lower than 50 ℃, three or four stages of pressing should be adopted, and the pressing speed should be slow. When the bending forming mode is adopted, the bending temperature is between 20 ℃ and 140 ℃, and the bending time is 15 s-1 min.
Further, the step S1 in the preparation method is specifically implemented by the following operation flow:
s1.1, cutting a magnesium alloy plate into a required shape, and then carrying out surface treatment on the cut magnesium alloy plate to form a protective layer on the surface of the magnesium alloy;
s1.2, bonding the magnesium alloy layer and the fiber layer through a room temperature curing adhesive or a heating curing adhesive to form a magnesium alloy fiber composite material with a two-layer structure or a three-layer structure, and repeatedly rolling the stacked and bonded composite material for a plurality of times by using a roller wheel, so that the close bonding between the adjacent layers is ensured;
s1.3, attaching high-temperature-resistant polymer films on the upper and lower surfaces of the magnesium alloy fiber composite material after the step S1.2 is completed, treating the magnesium alloy fiber composite material in a hot-pressing mode, and partially curing an interlayer adhesive while further tightly attaching each layer of material, wherein the hot-pressing pressure is 0.2-1 MPa, the hot-pressing temperature is 20-180 ℃, and the hot-pressing time is 10-30 min; the hot-pressing pressure intensity is carefully selected, so that the adhesive can enter micropores on the metal surface, and the good combination of the adhesive and the metal is realized.
It should be noted that, in step S1.1, the magnesium alloy surface treatment includes the following steps:
s1.1.1, treating the surface of the magnesium alloy by a sand blasting or mechanical sand paper polishing mode, removing an oxide layer on the surface of the magnesium alloy, enabling the surface of the magnesium alloy to have a certain roughness, and flushing surface dirt with clear water;
s1.1.2 degreasing the ground magnesium alloy, then washing with ultrasonic waves to remove the degreasing agent remained on the surface of the magnesium alloy, and drying the surface of the magnesium alloy with compressed air;
s1.1.3 performing chemical passivation or micro-arc oxidation operation on the dried magnesium alloy to form an anti-corrosion protection layer with a micropore structure on the surface of the magnesium alloy, wherein the chemical passivation is performed in a phosphate, silicate or stannate solution; the micro-arc oxidation is carried out in a solution of phosphate and/or silicate, the thickness of the generated micro-arc oxidation layer is between 1 and 5 mu m, and the thickness of the micro-arc oxidation layer is preferably between 2 and 4 mu m; drying the treated magnesium alloy;
in order to achieve better bonding force between the magnesium alloy and the fiber layer, a chemical treatment step for the passivation layer or the micro-arc oxidation layer may be added after the step S1.1.3, namely: immersing the magnesium alloy obtained in the step S1.1.3 in an amine water solution or an amine alcohol solution for 5-15min, and then placing the magnesium alloy in a baking oven at 50-60 ℃ for 10-30min to dry the magnesium alloy. The amine aqueous solution can be an ethylenediamine aqueous solution, a diethylenetriamine aqueous solution or a m-phenylenediamine aqueous solution, the amine alcohol solution is an ethylenediamine-alcohol solution, a diethylenetriamine-alcohol solution or a m-phenylenediamine-alcohol solution, and the mass percentage concentration of the amine aqueous solution or the amine alcohol solution is 5% -25%.
Further, the magnesium alloy fiber composite material using room temperature curing adhesive is subjected to the step S3 at 20-30 ℃ for 1-5 h; the magnesium alloy fiber composite material using the heat-curable adhesive is subjected to the step S3 at 120-180 ℃ for 30-60 min.
The invention also provides a preparation method of the shell of the fiber reinforced magnesium alloy box, which is only applicable to the composite material with the two-layer structure, and specifically comprises the following steps:
s1, cutting a magnesium alloy plate into a required shape, and then carrying out surface treatment on the cut magnesium alloy plate to form a protective layer on the surface of the magnesium alloy;
s2, processing the magnesium alloy plate subjected to surface treatment into a box shell shape by a hot press forming mode or a bending forming mode;
s3, uniformly coating the room-temperature curing adhesive on the inner surface of the magnesium alloy box shell obtained in the step S2, attaching the fiber material to the inner surface of the magnesium alloy box shell coated with the adhesive, and rolling the surface of the fiber layer by using a roller so that the fiber layer is tightly attached to the magnesium alloy box shell;
s4, placing the composite box shell obtained in the step S3 into a mold, and then placing the mold into a pressurizing and curing device, wherein the curing temperature is 20-30 ℃, the curing pressure is 0.2-1 MPa, and the curing time is 10-30 min.
S5, placing the composite box shell after the step S4 at 20-30 ℃ for 1-5 hours to completely solidify the box shell composite material.
In the step S2 of the second preparation method, when a hot press forming mode is adopted, the hot press temperature is 120-140 ℃, the hot press time is 1-5 min, and the pressure is 0.2-1 MPa; when a bending forming mode is adopted, the bending temperature is 120-140 ℃, and the bending time is 15 s-1 min.
The beneficial effects of the invention are as follows:
(1) Compared with the metal fiber composite board existing in the prior art, the fiber reinforced metal composite material has the advantages of simple structure (only two layers or three layers), strong high temperature resistance and excellent comprehensive mechanical property, creatively changes the structural characteristics of the conventional fiber metal composite material, such as three layers or more, greatly reduces the thickness of the composite material, and maintains good mechanical property;
(2) The fiber reinforced magnesium alloy composite material with the two-layer structure or the three-layer structure can be subjected to subsequent heating processing treatment, is placed at 100-180 ℃ for 30-60 min, and is cooled to the room temperature of 20-30 ℃ without obvious deformation phenomenon, and the magnesium alloy layer and the fiber layer are still well combined.
(3) Compared with the luggage case made of aluminum alloy in the market, the luggage case made of the fiber reinforced magnesium alloy composite material has the advantages of about 1/3 weight reduction, strong shock resistance and good shock absorption effect; compared with the luggage case made of the magnesium alloy, the luggage case made of the fiber reinforced magnesium alloy composite material has more excellent comprehensive mechanical property and strong external force extrusion resistance, and can greatly reduce the risk of transportation damage; in addition, the surface of the fiber reinforced magnesium alloy composite material is provided with the protective layer, so that the corrosion and oxidation phenomena on the surface can be effectively prevented, and the service life is prolonged;
(4) The invention provides two preparation methods of fiber reinforced magnesium alloy box shells, which can be selected according to actual requirements and structural composition of fiber reinforced magnesium alloy composite materials, and are flexible and convenient to operate.
Drawings
Fig. 1 is a schematic structural diagram of a fiber reinforced magnesium alloy structural composite material in example 1.
Fig. 2 is a schematic diagram showing the shape of the AZ31B magnesium alloy sheet cut in examples 1 to 3.
Fig. 3 is a schematic structural view of the fiber-reinforced magnesium alloy structural composite material in example 2 and example 3.
Detailed Description
The invention will be further described with reference to the drawings and specific examples, without limiting the scope of the invention.
Example 1
The embodiment discloses a fiber reinforced magnesium alloy composite material and provides a method for processing and preparing a box shell by adopting the fiber reinforced magnesium alloy composite material. As shown in FIG. 1, the composite body has a three-layer structure (i.e., a sandwich structure) comprising a first magnesium alloy layer 1, a middle fiber layer 2 and a second magnesium alloy layer 3 which are sequentially laminated, wherein the adjacent layers are closely adhered by an adhesive 4, and the total thickness is 0.81mm. The magnesium alloy adopted in the embodiment is AZ31B, and the thickness of the AZ31B plate is 0.3mm; the fiber layer 2 used in this example was 3K carbon fiber prepreg, the thickness of the 3K carbon fiber prepreg was 0.35mm, and the carbon fiber prepreg contained 42% of epoxy resin. The adhesive used in this example was a mixture of E-51 epoxy resin and TZ-550 curative. The performance parameters of the fiber reinforced magnesium alloy composite of this example are shown in Table 1.
The preparation of the fiber reinforced magnesium alloy composite material and the operation procedure of processing the composite material to form the box shell are as follows:
s1, cutting an AZ31B magnesium alloy plate into a shape shown in FIG. 2, and then performing surface treatment on the cut magnesium alloy plate to form a protective layer on the surface of the magnesium alloy to obtain a first magnesium alloy layer 1 and a second magnesium alloy layer 3;
s2, uniformly coating the adhesive 4 on the surface of the first magnesium alloy layer 1, wherein the dosage of the adhesive 4 is 0.008g/cm 2 ；
S3, cutting the 3K carbon fiber prepreg cloth into a shape matched with the first magnesium alloy layer 1, then spreading the 3K carbon fiber prepreg cloth on the surface of the first magnesium alloy layer coated with the adhesive 4, and slightly pressing the 3K carbon fiber prepreg cloth to be tightly attached to the surface of the first magnesium alloy layer so as to form an intermediate fiber layer 2;
s4, uniformly coating a small amount of adhesive 4 on the intermediate fiber layer 2, wherein the dosage of the adhesive 4 is 0.004g/cm 2 And placing the second magnesium alloy layer 3 on the intermediate fiber layer 2 coated with the adhesive, thereby forming a sandwich structure;
s5, tightly attaching the sandwich composite material stacked and bonded in the step S4 and partially curing;
s6, bending the sandwich composite material in the step S5 in a bending forming mode to form a box shell shape, wherein the bending temperature is 120 ℃;
s7, completely curing the box shell composite material to obtain the fiber reinforced magnesium alloy box shell, wherein the curing temperature is 140 ℃, and the curing time is 45min.
The adhesive involved in the steps is a heat-curable adhesive, which is prepared from E-51 epoxy resin and TZ-550 curing agent according to the weight ratio of 6.6:1 are mixed to prepare the composite material. In addition, the surface treatment of the magnesium alloy sheet material in the step S1 specifically includes the following steps:
s1.1, polishing the surface of the magnesium alloy by adopting modes such as 120 silicon carbide sand paper or sand blasting and the like to remove an oxide layer on the surface of the magnesium alloy and enable the surface to have certain roughness, and flushing dirt on the surface of the magnesium alloy by using clear water;
s1.2, degreasing the polished magnesium alloy, then washing with ultrasonic waves to remove a degreasing agent remained on the surface of the magnesium alloy, and drying the surface of the magnesium alloy with compressed air;
s1.3, performing micro-arc oxidation operation on the magnesium alloy treated in the step S1.2 to create a protective layer with a micropore structure and corrosion resistance, wherein the micro-arc oxidation electrolyte is a mixed solution of silicate and phosphate, the thickness of a generated micro-arc oxidation layer is 4 mu m, and drying the magnesium alloy subjected to the micro-arc oxidation treatment;
s1.4, immersing the magnesium alloy obtained in the step S1.3 in an ethylenediamine-ethanol solution with the mass percentage concentration of 15% for 10min, and then drying in a 55 ℃ oven for 15min.
It is to be noted that, for step S5 in the operation flow, step S5 specifically includes the following operations:
s5.1, repeatedly rolling the upper surface and the lower surface of the sandwich composite material for a plurality of times through a roller so as to ensure the close fit between different layers;
s5.2, respectively attaching high-temperature-resistant polyimide films to the upper and lower surfaces of the sandwich composite material, and then placing the polyimide films between an upper heating plate and a lower heating plate of a flat plate hot press;
s5.3, partially curing the sandwich composite material by a hot-pressing mode, wherein the pressure is 0.2 MPa, the hot-pressing temperature is 45 ℃, and the pressing time is 30min.
Example 2
The embodiment provides a fiber reinforced magnesium alloy composite material and a method for manufacturing a box shell by processing the same, as shown in fig. 3, the composite material is of a two-layer structure, and the thickness of the composite material is 0.6mm, and the composite material comprises an outer magnesium alloy layer 101 and an inner fiber layer 102. The material of the outer magnesium alloy layer 101 is AZ31B, and the thickness of the AZ31B plate is 0.5mm; the inner fiber layer 102 is 1K carbon fiber cloth, and the thickness of the 1K carbon fiber cloth is 0.3mm. The outer magnesium alloy layer 101 and the inner fiber layer 102 are bonded and fixed by a room temperature curing adhesive 103, so that the outer magnesium alloy layer 101 and the inner fiber layer 102 are closely adhered together. The adhesive 103 used in this embodiment is a mixture of E-51 epoxy resin, TZ-550 curing agent and curing accelerator 2,4, 6-tris (dimethylaminomethyl) phenol, and belongs to room temperature curing adhesive 103, so that the bonding sites between the inner fiber layer 102 and the outer magnesium alloy layer 101 are generated at room temperature of 20-30 ℃, and deformation phenomenon caused by different material shrinkage rates in the cooling stage of a heat curing system is avoided. The performance parameters of the fiber reinforced magnesium alloy composite of this example are shown in Table 1.
The preparation of the fiber reinforced magnesium alloy composite material and the operation procedure of processing the composite material to form the box shell are as follows:
s1, cutting an AZ31B magnesium alloy plate into the shape shown in FIG. 2, and then performing surface treatment on the magnesium alloy plate to form a micro-arc oxidation layer on the surface of the magnesium alloy to obtain an outer magnesium alloy layer 101;
s2, uniformly coating an adhesive 103 on the surface of the outer magnesium alloy layer 101 obtained in the step S1, wherein the dosage of the adhesive 103 is 0.02g/cm 2 ；
S3, cutting 1K carbon fiber prepreg cloth into a shape matched with the outer side magnesium alloy layer 101, then spreading the carbon fiber prepreg cloth on the surface of the outer side magnesium alloy layer 101 coated with the adhesive 103, and pressing and tightly attaching the carbon fiber prepreg cloth until the adhesive 103 permeates to the surface of the carbon fiber cloth and is uniformly distributed, so that an inner side fiber layer 102 is formed;
s4, tightly attaching and partially curing the two-layer structure composite material stacked and adhered in the step S3;
s5, pressing the partially cured two-layer structure composite material in the step S4 into a box shell shape through a hot press provided with a box shell die, wherein the pressing temperature is 40 ℃, and applying force in a four-section pressing mode;
s6, completely curing the case composite material, and placing the partially cured case at the room temperature of 20-30 ℃ for 4 hours to obtain the fiber reinforced magnesium alloy case.
The above steps are to be noted, the adhesive 103 belongs to room temperature curing adhesive 103, and the weight ratio of E-51 epoxy resin to TZ-550 curing agent is 6.6:1, and then adding 2,4, 6-tris (dimethylaminomethyl) phenol accounting for 3.5 percent of the total weight and uniformly stirring. In addition, the operation flow of step S1 is the same as step S1 of embodiment 1.
It should be noted that, for step S4 in the operation flow, step S4 includes the following operations:
s4.1, respectively attaching high-temperature-resistant polyimide films to the upper and lower surfaces of the two-layer structure composite material, repeatedly rolling the composite material for a plurality of times by using a roller, and then placing the composite material between an upper heating plate and a lower heating plate of a flat hot press;
s4.2, partially curing the composite material by a hot pressing mode, wherein the pressure is 0.4MPa, the hot pressing temperature is 25 ℃, and the pressing time is 30min.
The step S5 in the operation flow needs to be described as a four-stage force application method specifically: the pressure of the first section is 0.0008MPa, and the duration of the first section is 60s; the pressure of the second section is 0.002 MPa, and the duration of the second section is 120s; the pressure of the third section is 0.006 MPa, and the duration of the third section is 200s; the fourth stage pressure was 0.02 MPa and the fourth stage duration was 520s.
Example 3
The embodiment provides a fiber reinforced magnesium alloy composite material and a method for manufacturing a box shell by processing the same, wherein the composite material is of a two-layer structure, has the same structural composition as that of the embodiment 2, but has a thickness of 0.65mm, and comprises an outer magnesium alloy layer and an inner fiber layer. The material of the outer magnesium alloy layer is AZ31B, and the thickness of the AZ31B plate is 0.4mm; the inner fiber layer is 3K aromatic carbon mixed woven fiber cloth, and the thickness of the 3K aromatic carbon mixed woven fiber cloth is 0.3mm. The outer side metal layer and the inner side fiber layer are adhered and fixed through a room temperature curing adhesive, so that the outer side magnesium alloy layer and the inner side fiber layer are tightly adhered into a whole. The adhesive of the embodiment is a mixture of a room temperature curing epoxy resin adhesive and an epoxy resin curing agent, wherein the room temperature curing epoxy resin adhesive and the epoxy resin curing agent are respectively an product EL2 Epoxy Laminating Resin of the company easy components and a FAST curing agent AT30 FAST; the adhesive of the embodiment belongs to an adhesive solidified at room temperature, so that a bonding site between the fiber layer and the metal layer is generated at room temperature, and deformation phenomenon caused by different material shrinkage rates in a cooling stage of a heat curing system is avoided. The performance parameters of the fiber reinforced magnesium alloy composite of this example are shown in Table 1.
The preparation of the fiber reinforced magnesium alloy composite material and the operation procedure of processing the composite material to form the box shell are as follows:
s1, cutting an AZ31B magnesium alloy plate into the shape shown in FIG. 2, and then performing surface treatment on the magnesium alloy plate to form a passivation layer on the surface of the magnesium alloy to obtain an outer magnesium alloy layer;
s2, processing the outer magnesium alloy layer into a box shell shape by using a bending machine, wherein the bending temperature is 120 ℃, and the bending time is 20S;
s3, uniformly coating an adhesive on the inner surface of the magnesium alloy case obtained in the step S2, wherein the dosage of the adhesive is 0.02g/cm 2 Attaching 3K aromatic carbon mixed woven fiber cloth to the inner surface of the magnesium alloy box shell coated with the adhesive, and pressing and attaching until the adhesive permeates to the inner surface of the fiber cloth and is uniformly distributed;
s4, rolling the surface of the fiber layer by using a manual roller so that the fiber layer clings to the magnesium alloy box shell;
s5, placing the composite material box shell obtained in the step S4 into a mold coated with a release agent, then placing the mold into pressurizing and curing equipment, applying the pressure of 0.8 MPa at the room temperature of 20-30 ℃ and curing for 30min to obtain a partially cured composite material box shell;
s6, placing the partially cured composite material box shell in the step S5 at the room temperature of 20-30 ℃ for 5 hours to completely cure the box shell composite material, and obtaining the fiber reinforced magnesium alloy box shell.
It should be noted that, the specific operation flow of the step S1 is as follows:
s1.1, polishing the surface of the magnesium alloy by adopting modes such as 120 silicon carbide sand paper or sand blasting and the like to remove an oxide layer on the surface of the magnesium alloy and enable the surface to have certain roughness, and flushing dirt on the surface of the magnesium alloy by using clear water;
s1.2, degreasing the polished magnesium alloy, then washing with ultrasonic waves to remove a degreasing agent remained on the surface of the magnesium alloy, and drying the surface of the magnesium alloy with compressed air;
s1.3, performing phosphate chemical passivation treatment on the magnesium alloy subjected to the step S1.2, wherein the treatment temperature is 30 ℃, the treatment time is 5min, and drying the magnesium alloy subjected to the passivation treatment;
s1.4, immersing the magnesium alloy obtained in the step S1.3 in a diethylenetriamine aqueous solution with the mass percentage concentration of 10% for 15min, and then drying in a 60 ℃ oven for 20min.
The performance parameters of the fiber reinforced magnesium alloy composites of example 1, example 2 and example 3 are detailed in table 1 below.
As can be seen from the above table, the fiber reinforced magnesium alloy composite material of the three embodiments still maintains excellent comprehensive mechanical properties while greatly reducing the thickness, has good temperature resistance, overcomes the defects of poor impact resistance, complex structural composition and thickness of several millimeters or even centimeters of the existing fiber metal composite material, and has the advantages of light weight, good damping effect and extremely low damage risk when being used for manufacturing the luggage case.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.

Claims (6)

1. The fiber reinforced metal composite material is characterized by comprising a metal layer and a fiber layer which are arranged in a laminated manner, wherein adjacent layers are fixed through bonding; the metal layer is subjected to micro-arc oxidation surface treatment in a solution of phosphate and/or silicate serving as a micro-arc oxidation electrolyte, so that a micro-arc oxidation layer is formed on the surface of the metal layer; soaking a metal layer with a micro-arc oxidation layer in an amine water solution or an amine alcohol solution with the mass percentage concentration of 5-25% for 5-15min, then drying at 50-60 ℃ for 10-30min, and then bonding with the fiber layer; the composite material is of a two-layer or three-layer structure, and the layers are closely attached;
the two-layer structure comprises an outer metal layer and an inner fiber layer, wherein the outer metal layer and the inner fiber layer are bonded through a room temperature curing adhesive, and the room temperature curing adhesive is used for assisting materials to complete curing at the temperature of 20-30 ℃;
the three-layer structure comprises a first metal layer, a middle fiber layer and a second metal layer which are sequentially laminated, wherein adjacent layers are bonded through a room temperature curing adhesive or a heat curing adhesive, and the heat curing adhesive is used for assisting materials to complete curing at the temperature of 40-180 ℃;
the metal layer is a magnesium alloy layer; the fiber layer is fiber prepreg cloth or fiber cloth without resin, and the fiber material is one or a mixed fabric of more of carbon fiber, kevlar fiber, polypropylene fiber and glass fiber.
2. The fiber reinforced metal composite of claim 1, wherein the composite has a thickness of from 0.6mm to 0.9mm.
3. A fiber reinforced magnesium alloy case, wherein the case shell of the case is made of the fiber reinforced magnesium alloy composite material according to claim 2.
4. The preparation method of the case shell of the fiber reinforced magnesium alloy case is characterized in that the fiber reinforced magnesium alloy composite material adopted by the case shell has a two-layer or three-layer structure, and the preparation method comprises the following steps:
s1, preparing a magnesium alloy fiber composite material with a two-layer or three-layer structure, so that the magnesium alloy fiber composite material is partially solidified;
the step S1 specifically comprises the following steps:
s1.1, cutting a magnesium alloy plate into a required shape, and then carrying out surface treatment on the cut magnesium alloy plate to form a protective layer on the surface of the magnesium alloy;
the surface treatment is to carry out micro-arc oxidation surface treatment in a solution of phosphate and/or silicate in a micro-arc oxidation electrolyte, and a micro-arc oxidation layer is formed on the surface of the metal layer; soaking the metal layer with the micro-arc oxidation layer in an amine water solution or an amine alcohol solution with the mass percentage concentration of 5-25% for 5-15min, and then drying at 50-60 ℃ for 10-30 min;
s1.2, bonding the magnesium alloy layer and the fiber layer through a room temperature curing adhesive or a heating curing adhesive to form a magnesium alloy fiber composite material with a two-layer structure or a three-layer structure, and repeatedly rolling the stacked and bonded composite material for a plurality of times by using a roller, so that the close bonding between the adjacent layers is ensured;
s1.3, attaching high-temperature-resistant polymer films on the upper and lower surfaces of the magnesium alloy fiber composite material after the step S1.2 is completed, treating the magnesium alloy fiber composite material in a hot-pressing mode, and partially curing an interlayer adhesive while further tightly attaching each layer of material, wherein the hot-pressing pressure is 0.2-1 MPa, the hot-pressing temperature is 20-180 ℃, and the hot-pressing time is 10-30 min;
s2, processing the partially solidified magnesium alloy fiber composite material in the step S1 into a box shell shape in a hot press molding or bending molding mode;
s3, completely curing the box shell composite material.
5. The method for preparing a shell of a fiber reinforced magnesium alloy case according to claim 4, wherein the step S3 is performed at 20 to 30 ℃ for 1 to 5 hours using a magnesium alloy fiber composite material of a room temperature curing adhesive; the magnesium alloy fiber composite material using the heat-curable adhesive is subjected to the step S3 at 120-180 ℃ for 30-60 min.
6. The preparation method of the case shell of the fiber reinforced magnesium alloy case is characterized in that the fiber reinforced magnesium alloy composite material adopted by the case shell is of a two-layer structure, and the preparation method comprises the following steps:
s1, cutting a magnesium alloy plate into a required shape, and then carrying out surface treatment on the cut magnesium alloy plate to form a protective layer on the surface of the magnesium alloy;
s2, processing the magnesium alloy plate subjected to surface treatment into a box shell shape by a hot press forming mode or a bending forming mode;
s3, uniformly coating the room-temperature curing adhesive on the inner surface of the magnesium alloy box shell obtained in the step S2, attaching the fiber material to the inner surface of the magnesium alloy box shell coated with the adhesive, and rolling the surface of the fiber layer by using a roller so that the fiber layer is tightly attached to the magnesium alloy box shell;
s4, placing the composite box shell obtained in the step S3 into a mold, and then placing the mold into a pressurizing and curing device, wherein the curing temperature is 20-30 ℃, the curing pressure is 0.2-1 MPa, and the curing time is 10-30 min;
s5, placing the composite box shell after the step S4 at 20-30 ℃ for 1-5 hours to completely solidify the box shell composite material.
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